stephen wampler of california, a husband and a father of two, has cerebral palsy.his wheelchair to begin the climb of his life. >> steve, how's it going man? >> long, long day. seven hours climbing. >> reporter: steve is aiming to become the first person with cerebral palsy to climb the famed el capitan in yosemite national park. he trained for more than a year. each draining pull of that rope bringing him five inches closer to the top. but it is a towering challenge. el capitan is not one empire state building, but two. >> that sun today was brutal. holy crap. >> reporter: and today, suspended more than 1,000 feet above ground, we called him. hello, steve? hey, it's david muir in new york. how are you? >> good, and you? >> reporter: i guess you're just kind of hanging out. >> kind of, if you want to call it that. >> reporter: he's been climbing and sleeping for three days now. another 650 feet? so, you're almost halfway there. >> yes. >> reporter: and none of this is surprising the woman who 15 years ago, became steve's wife. >> at first, i thought, i bet he's hav